ZSCORE

The 'ZSCORE' function consumes a flag, then normalizes a Geo Time Series™ or a LIST of Geo Time Series™ that are below by replacing their values by their Z-score.

The flag indicates whether to use the mean (False), or the median (True) to calculate the Z-score.

The Z-score of a value represents the number of standard deviations (or median absolute deviations) it is away from the mean (or the median).

If the GTS isn’t of type DOUBLE or if the deviation equals 0, an exception is raised.